CN107442120A - 一种Cu/ZrO2催化剂及其制备方法和用途 - Google Patents
一种Cu/ZrO2催化剂及其制备方法和用途 Download PDFInfo
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- 238000004519 manufacturing process Methods 0.000 title abstract description 5
- 239000003054 catalyst Substances 0.000 claims abstract description 67
- MCMNRKCIXSYSNV-UHFFFAOYSA-N ZrO2 Inorganic materials O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims abstract description 36
- IKDUDTNKRLTJSI-UHFFFAOYSA-N hydrazine monohydrate Substances O.NN IKDUDTNKRLTJSI-UHFFFAOYSA-N 0.000 claims abstract description 26
- NWZSZGALRFJKBT-KNIFDHDWSA-N (2s)-2,6-diaminohexanoic acid;(2s)-2-hydroxybutanedioic acid Chemical compound OC(=O)[C@@H](O)CC(O)=O.NCCCC[C@H](N)C(O)=O NWZSZGALRFJKBT-KNIFDHDWSA-N 0.000 claims abstract description 24
- 238000002360 preparation method Methods 0.000 claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000006555 catalytic reaction Methods 0.000 claims abstract description 10
- 238000011084 recovery Methods 0.000 claims abstract description 8
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000010949 copper Substances 0.000 claims description 55
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- 238000006243 chemical reaction Methods 0.000 claims description 10
- 239000012266 salt solution Substances 0.000 claims description 9
- 239000012065 filter cake Substances 0.000 claims description 7
- 238000005406 washing Methods 0.000 claims description 7
- 239000008367 deionised water Substances 0.000 claims description 6
- 229910021641 deionized water Inorganic materials 0.000 claims description 6
- 230000009467 reduction Effects 0.000 claims description 6
- 239000000243 solution Substances 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 5
- 150000001879 copper Chemical class 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- 150000003754 zirconium Chemical class 0.000 claims description 4
- 230000032683 aging Effects 0.000 claims description 3
- 238000006356 dehydrogenation reaction Methods 0.000 claims description 3
- 238000010298 pulverizing process Methods 0.000 claims description 3
- 238000010792 warming Methods 0.000 claims description 3
- BNUDRLITYNMTPD-UHFFFAOYSA-N acetic acid;zirconium Chemical compound [Zr].CC(O)=O BNUDRLITYNMTPD-UHFFFAOYSA-N 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- XTVVROIMIGLXTD-UHFFFAOYSA-N copper(II) nitrate Chemical compound [Cu+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O XTVVROIMIGLXTD-UHFFFAOYSA-N 0.000 claims description 2
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 claims description 2
- OPQARKPSCNTWTJ-UHFFFAOYSA-L copper(ii) acetate Chemical compound [Cu+2].CC([O-])=O.CC([O-])=O OPQARKPSCNTWTJ-UHFFFAOYSA-L 0.000 claims description 2
- 125000001841 imino group Chemical group [H]N=* 0.000 claims description 2
- UJVRJBAUJYZFIX-UHFFFAOYSA-N nitric acid;oxozirconium Chemical compound [Zr]=O.O[N+]([O-])=O.O[N+]([O-])=O UJVRJBAUJYZFIX-UHFFFAOYSA-N 0.000 claims description 2
- 238000003756 stirring Methods 0.000 claims description 2
- DUNKXUFBGCUVQW-UHFFFAOYSA-J zirconium tetrachloride Chemical compound Cl[Zr](Cl)(Cl)Cl DUNKXUFBGCUVQW-UHFFFAOYSA-J 0.000 claims description 2
- OAKJQQAXSVQMHS-UHFFFAOYSA-N Hydrazine Chemical compound NN OAKJQQAXSVQMHS-UHFFFAOYSA-N 0.000 claims 2
- 239000003513 alkali Substances 0.000 claims 2
- 239000004348 Glyceryl diacetate Substances 0.000 claims 1
- 239000003795 chemical substances by application Substances 0.000 claims 1
- 235000019443 glyceryl diacetate Nutrition 0.000 claims 1
- 239000007788 liquid Substances 0.000 claims 1
- NBZBKCUXIYYUSX-UHFFFAOYSA-N iminodiacetic acid Chemical compound OC(=O)CNCC(O)=O NBZBKCUXIYYUSX-UHFFFAOYSA-N 0.000 abstract description 12
- 238000000034 method Methods 0.000 abstract description 10
- 238000006722 reduction reaction Methods 0.000 abstract description 9
- 229940043237 diethanolamine Drugs 0.000 abstract description 6
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 230000035484 reaction time Effects 0.000 abstract description 2
- 230000036632 reaction speed Effects 0.000 abstract 1
- 239000002243 precursor Substances 0.000 description 9
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 6
- 239000000843 powder Substances 0.000 description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 239000005562 Glyphosate Substances 0.000 description 4
- 230000003197 catalytic effect Effects 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 4
- XDDAORKBJWWYJS-UHFFFAOYSA-N glyphosate Chemical compound OC(=O)CNCP(O)(O)=O XDDAORKBJWWYJS-UHFFFAOYSA-N 0.000 description 4
- 229940097068 glyphosate Drugs 0.000 description 4
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- DHMQDGOQFOQNFH-UHFFFAOYSA-N Glycine Chemical compound NCC(O)=O DHMQDGOQFOQNFH-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009257 reactivity Effects 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- 238000000682 scanning probe acoustic microscopy Methods 0.000 description 2
- 102000007698 Alcohol dehydrogenase Human genes 0.000 description 1
- 108010021809 Alcohol dehydrogenase Proteins 0.000 description 1
- 239000004471 Glycine Substances 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- AZIHIQIVLANVKD-UHFFFAOYSA-N N-(phosphonomethyl)iminodiacetic acid Chemical compound OC(=O)CN(CC(O)=O)CP(O)(O)=O AZIHIQIVLANVKD-UHFFFAOYSA-N 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000000975 co-precipitation Methods 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- XTYUEDCPRIMJNG-UHFFFAOYSA-N copper zirconium Chemical compound [Cu].[Zr] XTYUEDCPRIMJNG-UHFFFAOYSA-N 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012847 fine chemical Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000013067 intermediate product Substances 0.000 description 1
- 150000002505 iron Chemical class 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 239000013528 metallic particle Substances 0.000 description 1
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 235000006408 oxalic acid Nutrition 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
- 239000000575 pesticide Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- ISIJQEHRDSCQIU-UHFFFAOYSA-N tert-butyl 2,7-diazaspiro[4.5]decane-7-carboxylate Chemical compound C1N(C(=O)OC(C)(C)C)CCCC11CNCC1 ISIJQEHRDSCQIU-UHFFFAOYSA-N 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
- 229910001928 zirconium oxide Inorganic materials 0.000 description 1
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
- B01J23/72—Copper
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/40—Catalysts, in general, characterised by their form or physical properties characterised by dimensions, e.g. grain size
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- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/50—Catalysts, in general, characterised by their form or physical properties characterised by their shape or configuration
- B01J35/51—Spheres
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- B01J37/16—Reducing
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- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C227/00—Preparation of compounds containing amino and carboxyl groups bound to the same carbon skeleton
- C07C227/02—Formation of carboxyl groups in compounds containing amino groups, e.g. by oxidation of amino alcohols
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Abstract
本发明提供一种Cu/ZrO2催化剂及其制备方法和用途,利用水合肼在碱性、中温环境下还原CuO/ZrO2前驱体,其中碱性环境有利于增强水合肼的还原性,中温环境有利于加快还原反应速度。通过调节水合肼的用量及还原时间控制催化剂的还原程度,加入冰水可以迅速终止还原反应。本发明首次利用水合肼在碱性、中温环境下制备Cu/ZrO2催化剂,催化剂中Cu存在三种价态为Cu0、Cu+、Cu2+,其摩尔比在1:0.20~0.35:0.01~0.06范围内,催化剂性能优异。该法制备时间短、耗能低,可以有效地控制催化剂的还原程度。制备的Cu/ZrO2催化二乙醇胺制备亚氨基二乙酸盐的收率超过98%,反应时间最短为2.3h,可望有良好的工业应用前景。
Description
技术领域
本发明涉及一种铜基催化剂。
背景技术
亚氨基二乙酸盐经酸化制备的亚氨基二乙酸是重要的精细化工原料,主要应用于制备广谱杀虫剂草甘膦。草甘膦的工业化制备路线主要有两种:甘氨酸路线和亚氨基二乙酸路线。亚氨基二乙酸路线是先合成亚氨基二乙酸,然后亚氨基二乙酸与甲醛、亚磷酸等反应生成双甘膦,双甘膦再进过氧化得到草甘膦。目前,亚氨基二乙酸路线是世界上最先进的生产草甘膦的方法,这种路线的关键点之一是中间产物亚氨基二乙酸的制备。
由二乙醇胺制备亚氨基二乙酸盐的催化剂通常为铜基催化剂。中国专利CN101733100A(2009)、CN1398850A(2003)及美国专利US5292936(1994),将Cu/ZrO2催化剂中加入少量镍、钼、钴、钒、钛等形成复合催化剂,有效地提高了催化剂的使用寿命,亚氨基二乙酸的收率95%左右,但添加贵金属增加了催化剂的成本。专利CN101954280A(2009)的铜铁系催化剂降低了反应温度和制备成本,亚氨基二乙酸的收率93.6%。专利CN101869843A(2010)将金属碳化物负载于载体(活性炭,氧化钛,氧化铝,或氧化锆)上,可以有效增加金属颗粒的分散性并提高反应的收率,同时也具备较好的寿命,但催化剂的制备过程繁琐,成本上升。专利CN103418382A(2012)将共沉淀法制备的铜锆沉淀颗粒加入有机溶剂和去离子水后加热回流,有效缩短了反应的时间,提高反应收率,但回流过程繁琐,设备要求较高。
最近的研究发现,铜基催化剂催化醇脱氢制备酸的反应,其催化活性中心不仅仅与Cu0有关,Cu+对反应的速率也有很重要的影响(Wang L,Zhu W,Zheng D,et al.Directtransformation of ethanol to ethyl acetate on Cu/ZrO2catalyst[J].ReactionKinetics,Mechanisms and Catalysis,2010,101(2):365-375)。Cu基催化剂通常是先制备形成金属前驱体,再在高温环境下通H2还原并隔氧冷却,还原过程中CuO经历了Cu2+→Cu+→Cu0的变化,ZrO2在制备过程中形成的带正点的氧空位导致附近的Cu+难以被还原,这是在H2还原的Cu/ZrO2催化剂中检测到Cu+的主要原因,并且Cu0/Cu+的比例是影响催化剂活性的关键(Freitas I C,Damyanova S,Oliveira D C,et al.Effect of Cu content on thesurface and catalytic properties of Cu/ZrO2catalyst for ethanoldehydrogenation[J].Journal of Molecular Catalysis A:Chemical,2014,381:26-37.)。
现有的制备Cu基催化剂的方法通常由H2还原其CuO前驱体,这个过程耗能高,还原时间长,还原程度不易控制导致催化剂的催化效果不太令人满意。
发明内容
本发明的目的是提供一种Cu/ZrO2催化剂及其制备方法和用途。
本发明的技术方案是,一种Cu/ZrO2催化剂,Cu颗粒呈球形,直径为1~4μm,负载于片层状的四方型ZrO2载体上。
催化剂中Cu的三种价态为Cu0、Cu+、Cu2+,其摩尔比在1:0.20~0.35:0.01~0.06。
一种Cu/ZrO2催化剂的制备方法,
(1)将铜盐溶液、锆盐溶液按1:2的体积比搅拌混合均匀,缓慢滴加0.8~1.0mol/L的碱溶液至混合液pH值=11~12,静置陈化4~6h后,水洗抽滤,将滤饼置于90~110℃恒温干燥箱中干燥10~12h,研磨成粉末后以1~2℃/min升温至520~550℃后焙烧4h,冷却后得CuO/ZrO2前驱体;
(2)将所制CuO/ZrO2前驱体加至1~1.2mol/L碱溶液中,搅拌并水浴升温后,缓慢滴加水合肼,反应后迅速加入冰水冷却,洗涤抽滤,滤饼在30~50℃下真空干燥12~18h后得所述的Cu/ZrO2催化剂。
所述Cu/ZrO2催化剂由水合肼在中温或碱性环境下还原CuO/ZrO2前驱体制得。
所述铜盐为醋酸铜、硝酸铜或硫酸铜中的一种,溶于去离子水中形成0.1mol/L的铜盐溶液。
所述锆盐为氯氧化锆、硝酸氧锆或醋酸锆中的一种,溶于去离子水中形成0.08~0.1mol/L的锆盐溶液;
所述碱溶液为NaOH或KOH溶液中的一种。
CuO/ZrO2前驱体质量与水合肼体积之比为1:0.075~1.5;碱溶液与水合肼的摩尔比为1:0.125~2.5;还原温度为30~70℃;还原时间为10~60min。
一种Cu/ZrO2催化剂的用途,应用于催化二乙醇胺脱氢反应制备亚氨基二乙酸盐。
本发明针对工业生产中存在的催化剂制备和催化反应时间长且收率不好的问题,提出一种制备过程中还原时间短、还原程度易控、催化剂活性高的催化剂的还原方法。该还原方法采用水合肼还原CuO/ZrO2前驱体,通过控制还原剂的量及还原时间控制还原程度,该法制备方法简单,制备时间短且原料价格低廉,制备的催化剂性能优异,极具工业应用价值。本发明所述的Cu/ZrO2催化剂由水合肼在中温、碱性环境下还原CuO/ZrO2前驱体粉末制得,碱性环境有利于增强水合肼的还原性,中温环境有利于加快还原反应的速度。
附图说明
图1为不同体积水合肼还原CuO/ZrO2前驱体粉末制备Cu/ZrO2催化剂的XRD图。
图2为水合肼量为1mL,还原时间为1h时制备的Cu/ZrO2催化剂的SEM图。
具体实施方式
实施例1:
一种Cu/ZrO2催化剂,Cu颗粒呈球形,直径为1~4μm,负载于片层状的四方型ZrO2载体上。
催化剂中Cu的三种价态为Cu0、Cu+、Cu2+,其摩尔比在1:0.20~0.35:0.01~0.06。
一种Cu/ZrO2催化剂的制备方法:
(1)将铜盐溶液、锆盐溶液按1:2的体积比搅拌混合均匀,缓慢滴加0.8~1.0mol/L的碱溶液至混合液pH值=11~12,静置陈化4~6h后,水洗抽滤,将滤饼置于90~110℃恒温干燥箱中干燥10~12h,研磨成粉末后以2℃/min升温至550℃后焙烧4h,冷却后得CuO/ZrO2前驱体固体,粉碎得前驱体粉末;
(2)称取所述10.0gCuO/ZrO2前驱体粉末加至100mL的1mol/L NaOH溶液中,机械搅拌并水浴升温至50℃后,缓慢滴加0.75mL质量分数为80%的水合肼,反应1h后迅速加入200mL冰水冷却,洗涤抽滤,滤饼在40℃下真空干燥12h后制得CZ-0.75催化剂。采用实施方案进行评价。
催化剂的性能评价结果见表1。
实施例2~6:
根据实施例1的方法,采用相同的制备方法并称取相同重量的CuO/ZrO2前驱体粉末,只是改变水合肼的量分别为1mL、1.5mL、3mL、6mL、12mL,制得的催化剂分别标记为CZ-1、CZ-1.5、CZ-3、CZ-6、CZ-12。采用实施方案进行评价。催化剂性能评价结果见表1。
表1各催化剂的二乙醇胺催化反应反应性能结果
实施例7:
称取所述10.0gCuO/ZrO2前驱体粉末加至100mL的1mol/L NaOH溶液中,机械搅拌并水浴升温至50℃后,缓慢滴加1mL质量分数为80%的水合肼,反应20min后迅速加入200mL冰水冷却,洗涤抽滤,滤饼在40℃下真空干燥12h后制得T-20催化剂。采用实施方案进行评价。催化剂的性能评价结果见表2。
实施例8~11:
根据实施例7的方法,采用相同的制备方法并称取相同重量的CuO/ZrO2前驱体粉末,只是改变还原时间分别为30min、40min、50min、60min,制得的催化剂分别标记为T-30、T-40、T-50、T-60。采用实施方案进行评价。催化剂性能评价结果见表2。
表2各催化剂的二乙醇胺催化反应反应性能结果
显然,本发明的上述实例仅仅视为清楚地说明本发明所做的举例,并非穷举,因而并非是对本发明的实施方式的限定。对于所属领域的普通技术人员来说,在上述说明的基础上还可以做出其它不同形式的变化或变动。凡是属于本发明的技术方案所引申出的显而易见的变化或变动均在本发明涵盖的精神范围之内。
图1为不同体积水合肼还原CuO/ZrO2前驱体粉末制备Cu/ZrO2催化剂的XRD图。随着水合肼含量的增加,CuO的含量减少,Cu的含量增加,在水合肼的使用量为15mL时,CuO的特征峰消失,说明随着水合肼含量的增加,CuO/ZrO2还原成Cu/ZrO2越彻底。但Cu/ZrO2的催化效果随着还原程度的提高先升高后下降,在水合肼的使用量为1mL时催化效果最好,控制还原深度,使催化剂中Cu的三种价态Cu0、Cu+、Cu2+的摩尔比在1:0.20~0.35:0.01~0.06范围内,其摩尔比的估算采用X射线光电子能谱(XPS)和俄歇电子能谱(AES)分析方法进行。此时催化剂中Cu的三种价态Cu0、Cu+、Cu2+共存。
图2为水合肼量为1mL,还原时间为1h时制备的Cu/ZrO2催化剂的SEM图,说明Cu/ZrO2催化剂中Cu颗粒呈球形,直径1~4μm,负载在片层状的ZrO2载体上。
评价实施方案:在300mL反应釜中加入二乙醇胺31.69g,催化剂6.0g,氢氧化钠25.21g,去离子水70g。密闭反应釜并通入氮气排空5~7次,反应温度维持在130~170℃,反应过程中压力升高到1.5MPa后排气至1.0MPa,釜内压强在20min内未升高至1.5MPa视为反应结束。
Claims (9)
1.一种Cu/ZrO2催化剂,其特征在于:Cu颗粒呈球形,直径为1~4μm,负载于片层状的四方型ZrO2载体上。
2.根据要求要求1所述的一种Cu/ZrO2催化剂,其特征在于:催化剂中Cu的三种价态为Cu0、Cu+、Cu2+,其摩尔比在1:0.20~0.35:0.01~0.06。
3.一种Cu/ZrO2催化剂的制备方法,其特征在于:
(1)将铜盐溶液、锆盐溶液按1:2的体积比搅拌混合均匀,缓慢滴加0.8~1.0mol/L的碱溶液至混合液pH值=11~12,静置陈化4~6h后,水洗抽滤,将滤饼置于90~110℃恒温干燥箱中干燥10~12h,研磨成粉末后以1~2℃/min升温至520~550℃后焙烧4h,冷却后得CuO/ZrO2前驱体;
(2)将所制CuO/ZrO2前驱体加至1~1.2mol/L碱溶液中,搅拌并水浴升温后,缓慢滴加水合肼,反应后迅速加入冰水冷却,洗涤抽滤,滤饼在30~50℃下真空干燥12~18h后得所述的Cu/ZrO2催化剂。
4.根据权利要求3所述的一种Cu/ZrO2催化剂的制备方法,其特征在于:所述Cu/ZrO2催化剂由水合肼在中温或碱性环境下还原CuO/ZrO2前驱体制得。
5.根据权利要求3所述的所述的一种Cu/ZrO2催化剂的制备方法,其特征在于:所述铜盐为醋酸铜、硝酸铜或硫酸铜中的一种,溶于去离子水中形成0.08~0.1mol/L的铜盐溶液。
6.根据权利要求3所述的所述的一种Cu/ZrO2催化剂的制备方法,其特征在于:所述锆盐为氯氧化锆、硝酸氧锆或醋酸锆中的一种,溶于去离子水中形成0.08~0.1mol/L的锆盐溶液。
7.根据权利要求3所述的所述的一种Cu/ZrO2催化剂的制备方法,其特征是在于:所述碱溶液为NaOH或KOH溶液中的一种。
8.根据权利要求3所述的所述的一种Cu/ZrO2催化剂的制备方法,其特征在于:CuO/ZrO2前驱体质量与水合肼体积之比为1:0.075~1.5;碱溶液与水合肼的摩尔比为1:0.125~2.5;还原温度为30~70℃;还原时间为10~60min。
9.一种Cu/ZrO2催化剂的用途,其特征在于:应用于催化二乙醇胺脱氢反应制备亚氨基二乙酸盐。
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